Guidance for Docker security hardening across the full lifecycle — image security (minimal base images, non-root users, pinned versions), runtime security (seccomp/AppArmor/SELinux, capabilities, read-only rootfs, no-new-privileges), secrets management (BuildKit secrets, Docker secrets in Swarm), Docker Bench Security auditing, CIS compliance checklist, and supply-chain security (image signing, content trust, SBOM). Use when the user asks about Docker security, image hardening, non-root containers, seccomp, AppArmor, Docker Bench, secrets management, or securing containers. 使用场景:docker 安全、镜像安全、非root运行、seccomp、AppArmor、security、Docker Bench、secret管理.